Phonograph tone-arm extension and reproducer mounting



T. E. DAviDsoN PHONOGRAPH TONE ARM EXTENSION AND .REPRODUCER-MOUNTING Dec. 25

- Fild Juiy 9, 1921 Patented Dec. 25, 1923.

UNITED STATI-*2s Alawn-:NT OFFICE.

THOMAS E. DAVIDSON, OF CHICAGO, ILLINOIS, ASSIGNOB TO JEWEL PHONOPABTS COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF.ILLINOIS. i'

PHONOGBAPH TONE-ABM EXTENSION AND REPRODUCEB MOUNTING.

Application filed July 9, 1921. Serial No. 483,420.

To all whom t may concern.'

Beit known that I, THOMAS E. DAvmaoN,l

a citizen of the United States, and a resident of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Phonograph Tone- Arm Extensions and Reproducer Mountings, of which the following is a description, reference being had to the accompanying drawing, which forms a part of my specification.y

-My invention relates to the mounting of the reproducer and to the tone arm extensions or couplings of a phonograph and more particularly to couplings or extensions for use with the tone arm of an Edison phonograph; the invention having for its object the provision of a construction whereby the reproducer on an Edison machine may be properly positioned for use with the lateral indentations or Victor type of record and also enable the positioning of the reproducer for use on records having the hill and daleindcntations, namely with the Edison type of record.

The purpose of my invention is to provide a reproducer connection and tone arm ex tension so formed that a suiiicient amount of movement of the reproducer, independent of that of the tone arm proper may be had so- 3" that a proper reproduction of the Victor type of records may be had on an Edison machine; that is to say the reproducer mounting and tone arm extension are so formed that additional movement of the rcproducer, in keeping 'with the faster feed of the Victor type of record, may be possible, thus enabling thereproduction of both types of record regardless of the difference in feed or number of grooves to a given area of space.

A further object of my invention is to provide a tone arm extension and reproducer coupling whereby a proper positioning of the reproducerl for'the initial or starting pointlnay be ensured and therefore the too far movement of the reproducer to'wardone side ofthe longitudinal axis of the tone arm connection prevented.

The objects and advantages of my improved construction will all be more fully comprehended from the detail description of the ac compa-nying drawings, wherein Figure 1 is a side elevation of my improved tone arm and reproducer mounting as applied to the Edison tone arm, with the reproducer positioned in full lines for use in connection with the Victor type of record, while the reproducer position for use in connection with the Edisontype of record is shown in dotted lines.

Figure 2 is an enlarged longitudinal sectional view of the toneA arm extensions and reproducer mountings.

Figure 3 is a detail bottom 1an viewas viewed along the lines 3-3 of igure 2 lookingdn the direction of the arrows.

igure 4 is a cross sectional view taken onthe line 4-4 of Figure 2 looking in the direction of the arrows.

Figure 5 is a plan and sectional view of the reproducer back and connection.

In the drawing, 10 represents the upper outer end of the usual type of Edison tone arm, the outer end whereof is provided with a slot 10 and a knurled collar or nut 11 which is provided with a diagonally formed slot as shown'in Figure 1 to receive the pin 12 secure to the reducedend 13 of my improved tone arm extension or coupling member,'the outer end whereof is enlarged as at 14 to provide a compar-atively large orifice and constitutes the socket member for the reception of the spherical end 15 of a second coupling member 16. The latter is adapted to receive the reduced end 17 of an elbow connection 18. The outer or free end of the coupling member 16 is provided with a circumferentially disposed-slotted boss 19 extending Vsubstantially a quarter of the distance about the coupling -member 16 as shown in Figure 4. The boss at the ends of the slot is shown provided with countersunk or somewhat dished portions 20 adapted to receive the rounded end of a cup member 21 which latter is' provided with a small coil spring 22 arranged about screw 23 which extends through the cup member into a tapped opening in the elbow coupling member 18. As is apparent from the construction shown and described, the screwing inward of the screw 23 causes the coil spring 22 tol be compressed and therefore places cup member 21 under pressure so that the rounded end of the cup member 21 will be firmly forced into frictional contact with the enlargement or boss 19 on the end of the coupling member 16. By providing the ends of the boss or enloo - 3 in order that it largement 19 with the somewhat countersunk or dished portions 20, the cu member 21 will seat itself therein, and, y reason of the pressure of the spring, will lock the reproducer with the coupling member 18. in its adjusted position. The spherical portion 15 on its lower side is provided with a socket 24, which is adapted to receive the spherical end 25 of the screw member 26 whic passes through the enlarged end 14 of the inner coupling, or socket member 13 and thereby prevents the withdrawal of the spherical end 15 Y- of the connection 16, at the same time, however permitting complete or free movement of the upper portion of the spherical or ball portion 15, and placing all movement entirely on the ball-tip end 25 of screw 26; the latter 'being so formed that free movement is made possible without possibility of binding. The socket 24 is preferably made of a depth slightly greater than the inner end of the screw member 26 so as to provide a small space beyond the end of the spherical head 25 in which lubricant may be placed; the lubricant being held therein by the spherical head 25 which is in close-contact with the sides of the slot 24, but at the same time in a manner which will rmit free rocking movement thereabout. e enlarged end 14 of the inner coupling member, at a point adjacent to where the screw member 26 is in- .serted therethrough, is provided with a downwardly and somewhat forwardly presented lip 27 adapted to extend somewhat forward of the enlarged end of the socket member or 'coupling 14 to provide an abutment for a ldownwardly and rearwardly curved lug 28 formed on the end of the coupling member 16 at a point adjacent to the spherical part 15 as clearly shown in Figure The projection or lug 28 is disposed into the path of the projection or lip 27 and the end of the lug or projection 28 is preferably slightly enlarged as shown at 29 in Figure may also have abutting relation with the screw-plug or pivot member 26 and thereby prevent the too fardownward movement of the reproducer and the connections or extensions 16 and 18; the screw-plug or pivot member 26 acting as an abutment or stop for the depending projection or lug 28 even though the couplings or extensions 16 and 18 may be disposed toward one side of the longitudinal axis of member 13 and the tone-arm proper as is clearly apparent' from the drawings.

e reproducer-back is provided with an outwardly tapering tubular hub or projection 30 about the outlet orifice hauling from the impulse chamber, and this tubular hub or tapered projection is provided with an enlargement or circumferentially dis slotted boss 31 extending partiall about the hub. The boss 31, at the ends ofy the slot, is countersunk or slightly=depreseed as at 32;

the depressions bein adapted to receive the lower convexed en of a cup member 33 -which is provided with a screw 34 encircled holds the rounded end of cup member 33 in 7 gripping relation with the enlargement or boss 31 of the reproducer-back; the cup member seating .itself in the countersun portions or depressions 32 as soon as the reproducer has been suliciently rotated, with ll theresult that the reproducer will be firmly held in its adjusted positions relative to the elbow coupling 18.

The construction shown and described provides a tone arm extension and reproducer mounting which will adapt the invention to the Edison machine, and will enable the proper positioning ofthe reproducer for either the hill and dale type or Edison record or to the lateral type or Victor record.

The head of the stylus-bar is shown provided with a pair of stylus-receiving sockets; one extending lengthwise of the head to receive the stylus when intended for use on the Victor type of record, while the other socket is diagonally disposed and arranged at an acute angle to the first mentioned Socket to receive the stylus when intended to reproduce an Edison record, namely with the stylus it-ioned as shown in dotted lines at 37 in Figure 1.

The method of coupling or pivotally mounting the connection or extension member 16 in the socket or inner coupling 13-14 provides a very easy action for the connections and the reproducer, as the ball-tipped screw 26 places the entire movement of the spherical portion 15 on the ball end of the screw member or plunger 26 Without causi g undue friction and thus provides freedom for the upper part of the spherical connection with the lateral movement taking place about the pivot member or screw 26 as reviously described.

Wit Amy improved construction, `the use of the V'ctor type of record on an Edison machine is made possible, because the reproducer with the coupling members or extensions 16 and 18 will be permitted to have movement in addition to thatof the main portion of the Edison tone arm and therefore compensate for the increased number of indentation grooves and faster feed required for the Victor type of record; said additional movement being obtained by the lateral or sidewise movement of the coupling 16 about the pivot screw 26. The lip or lugr 27 is arranged on the enlarged portion v14 of the coupling member 13 so that it will contact with the side of the lug or extension 28 lll disposed toward vthe reproducer when the latter is positioned for the reproduction of a Victor record; the purpose of the li or lug 27 being to provide a stop for initially positioning the tone arm and reproducer, namelyl for the purpose of bringing the reproducer and couplings 16-18 into alignment with the main portion of the tone arm when swung to the beginning or outermost groove of the record. The pivotal connection will enable the reproducer to feed or travel slightly 'faster than the travel of the main portion of the tone arm and therefore move somewhat in advance of the tone arm; the enlar ed end of the lug or extension 28 moving a out the pivot pin 26 and preventing the reproducer dropping down too far as previously described.

I have shown and described what I believe to bethe simplest and best embodiment of my invention which has been described in terms and expressions used merely as terms of description and not of limitation, as certain structural modifications are pos sible and may be made without, however, de arting from the spirit of my invention.

hat I claim is 1. Means of the character described, comprising a tone arm en agin vided with an enlarge ,ori ce, a coupling lmember 'provided with a spherical end adapted to enter the enlarged orifice of the first member, and removable means disposed. through vone side of the first member and into the spherical end of the second member whereby said spherical end is locked in place andl oscillatory movement of the coupling member permitted.

2. Means of' the character described, comprising, in combination with a tone arm, a tubular member provided with an enlar d cylindrical end, a coupling member provi ed -with a spherical end adapted to enter thel enlarged cylindrical end of said tubularmember, the lower side of the spherical end being rovided with a socket, a screw' removabll; secured fto the tubular member and provided with a rounded ti adapted to enter the socket.in the spherica end of the cou ling member whereby the latter is held 1n place and free oscillatory movement of the upper portion of the spherical end about said screw permitted, and a pairof nonaligned opposing lugs secured, respectively, to the tubular member andltopthel coupling member wherebyvthe degree of' vertical and i lateral oscillatory movement of the coupling member is controlled.

3. Means of the character described, comprising a tubular member adapted to be secured in the outer end of a tone. arm and provided with a downwardly `and forwardly disposed lug arranged on one side of the longitudinal axis of said member, a second member provided with l spherical end armember proranged within the outer end4 of the first.

vided with a downwardly and rearwardly7 disposed lug substantial] in alignment with the longitudinal axis o said member and terminating in an enlarged end adapted to bear against said pivot-providin screw and to engage with the lug of the rst member to prevent lateral movement of the second member toward one side of the longitudinal axis of the tubular member.

4. Means of the character described, comprising a tubular member adapted to be secured to the outer end of ai tone arm and provided with a projection, a coupling member provided with a spherical end adapted to enter the end of said tubular member and provided with a socket, and means secured to t the tubular member and adapted to enter the socket of the spherical end of said cou.- pling member whereby the latter is held in place and free oscillatory' movement at the opposite side of the spherical end permitted, said coupling member being provided with a projectionl adapted ltoi engage wtith said means to limit vertical movement of the coupling member in one direction and t0 engage with the projection on the tubular member to limjit movement of the coupling member in a'fsecond direction.

5. Means of the character described, com- \prising,\ in combination with a tone arm,

a cylindrical member secured to the end of the tone arm and provided with a forwardly disposed lug, a second member provided with a spherical end adapted to enter said cylindrical member, the lower side of said spherical end being provided with a socket,

the second member being provided with a- 6. Means of thelcharacter described, coniprising a member adapted to be secured to the outer end of va tone arm, a second member having a spherical end adapted to fit into` one end of the rst member, means whereby the spherical end of the second member is pivotally held in place at the lower side thereof, while free movement throughout the upper portion is permitted, a forwardly positionilel of the second member may be presented lug,r on the lower side ofthe first determ and the downward movement member at a point in proximity to said means, thereof controlled.

and a rearwardly disposed lug on the lower side of the second member ada. ted to engage with said means and to a ut against said first mentioned lug, whereby the initial THOMAS E. DAVIDSON. Wimesses:

G. Humm, F. A. Fmlmu. 

